Foot spa base



FIG. 1 is a perspective view of our foot spa base;

FIG. 2 is a front plan view;

FIG. 3 is a front elevation view;

FIG. 4 is a back elevation view;

FIG. 5 is a left side elevation view; and,

FIG. 6 is a right side elevation view.

The broken line showing of a seat and bowl in FIGS. 1-6 is illustrativeof environmental structure only and forms no part of the claimed design.

The ornamental design for a foot spa base, as shown and described.